In the near future,peope in some parts of the world will watch a new kind of television.It is called the high definition television or the HD-TV.The main difference between an HD-TV and a normal television is the picture.It is more clear and detailed.This is because the HD-TV has many more points and lines that make a television image .Every color television picture contains thousands of red,green and blue points.They all come together as an image in the eye of the person watching .The prints are organized in lines that go across the television screen.There are more than ifve hundred lines in a normal television.The DH-TV has two times as many.
To get this clear picture.you must have a big screen .Experts say people using a small screen will see little difference .The HD-TV.also has clear sound .It is like the sound on a CD.All these improvenments make an DH-TV very costly.One dind in Japan now sells for mre than twenty thousand dollars .A.major problem with the HD-TV is its broadcast signal.The signal is bigger than normal because it carries moreelectronic information.
64.what is the main difference between an HD-TV and a mormal television?It is ______?
A.the picture
B.the shape
C.the voice
D.the weight
65.how many lines does an HD-TV have?
A.over 250
B.more than 500
C.more than 1000
D.about 250
66.what should you do if you want to get a clear and detailed picture from an HD-TV?
A.you must have the bigger signal for the HD-TV.
B.you have to get a big screen.
C.you should have to pay more money.
D.both A and B.
67.according to the passage,which of the following is TRUE?
A.the HD-TV sets are not popular now because they are too expensive for most people.
B.the signal for the HD-TV is not bigger than that ofr the normal TV
C.in the future the HD-TV will cost 10 times as much sa it costs now.
D.only Japan can make the HD-TV.

64.A
65.C
66.b
67.A